第二次世界大戰後,美國、前蘇聯及其他國家在1951-1963年之間分別在地面上進行數以百計的核試,485Please respect copyright.PENANApzIOh3ZZ7B485Please respect copyright.PENANAShggoStUEC
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直至1963年大家互相簽署了停止核試條約,地面引爆核試才得以終止進行;雖然1960-1970年間中國及非洲仍有進行少量微型地面核試。485Please respect copyright.PENANAwHLiazx5cG
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地面核試,無疑會為大自然界帶來影響。485Please respect copyright.PENANAhL58zFhctF
其中一隻名為137Cs的幅射性原子,不但能對生物帶來傷害,且具有水溶性特質,其半衰期亦達30.2年之多;485Please respect copyright.PENANAPqNXvk5JH4
亦即是說渡過30.2年之後,其濃度才會自然地減半。485Please respect copyright.PENANAF60nbQN3er
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(圖2)植物普遍需要鉀元素(K)輔助生長,因此天生擁有相應的蛋白質負責吸取泥土的鉀元素。485Please respect copyright.PENANAGc8UTNWCYq485Please respect copyright.PENANAZs6DkvcRdz
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然而基於137Cs與K的特質非常相似,植物不其然間亦會因而吸取了帶有幅射性的137Cs原子。485Please respect copyright.PENANA0Wb0o8Ookl
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如果往植物施上含鉀元素(K)或銨 (NH4)的肥料,均可大幅度減低植物吸取泥土間137Cs的效率。485Please respect copyright.PENANAoRhzPfXiHI
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(圖3)科學家審視2017-2019年美國各地的蜜糖商品,發現122個樣本中並有68個樣本測量出137Cs的存在。485Please respect copyright.PENANAQLwBaI4gSu485Please respect copyright.PENANALLKIvKCXr9
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不過其含量非常之低,平均僅約0.03Bq 137Cs kg−1,最高濃度的樣本為19Bq 137Cs kg−1,依然遠低於美國FDA制定的1200Bq 137Cs kg−1安全界線。485Please respect copyright.PENANA9WDnwsiqZ2
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研究還發現,當地蜜糖樣本是否含有137Cs原子,與當地泥土的137Cs含量並無任何關連。485Please respect copyright.PENANAhoYdOuwjAH
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無論如何,核廢理的處理與人類生活健康的議題,均需密切關注,不容忽視。485Please respect copyright.PENANAuFEGEs4dbm
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